@article{65476,
  abstract     = {{Service research has evolved into an interdisciplinary research field that bridges diverse disciplines, including information systems (IS) and marketing. Nearly two decades ago, the service system concept was introduced as a foundational abstraction in service research, drawing on ideas from the service-dominant logic (S-D logic) of marketing. Despite its widespread adoption in service research, particularly in the IS discipline, the service system concept lacks a solid theoretical foundation. This has resulted in conceptual ambiguity and overlap with related constructs, such as service ecosystems. Moreover, it has largely remained a static analytical lens, insufficiently capturing dynamic service phenomena, including value co-creation and co-destruction, as well as the emergence of institutional arrangements. To address these limitations, we propose Luhmann’s systems theory (LST) as a robust framework for conceptualizing service systems as autopoietic (self-creating) systems, in which communication serves as the fundamental mechanism that drives value co-creation. We derive five theoretical propositions from this re-conceptualization that clarify conceptual ambiguity and allow researchers to explore dynamic service phenomena in greater depth. Given LST’s general approach, our conceptualization provides a theoretically grounded, interdisciplinary foundation for advancing service research.}},
  author       = {{Beverungen, Daniel and Poeppelbuss, Jens and Hemmrich, Simon and Iqbal, Taskeen}},
  issn         = {{1019-6781}},
  journal      = {{Electronic Markets}},
  keywords     = {{Service system, Service ecosystem, Systems theory, Service research}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Service through communication—Conceptualizing service systems with Luhmann’s systems theory}}},
  doi          = {{10.1007/s12525-026-00889-w}},
  volume       = {{36}},
  year         = {{2026}},
}

@article{65847,
  abstract     = {{Simulating vibronic spectra is a central task in physical chemistry, offering insight into important properties of molecules. Recently, it has been experimentally demonstrated that photonic platforms based on Gaussian boson sampling (GBS) are capable of performing these simulations. However, whether an actual GBS approach is required depends on the molecule under investigation. To develop a better understanding on the requirements for simulating vibronic spectra, we explore connections between theoretical approximations in physical chemistry and their photonic counterparts. Mapping these approximations into photonics, we show that for certain molecules the GBS approach is unnecessary. We place special emphasis on the linear coupling approximation, which in photonics corresponds to sampling from multiple coherent states. By implementing this approach in experiments, we demonstrate improved similarities over previously reported GBS results for formic acid and identify the particular attributes that a molecule must exhibit for this, and other approximations, to be valid. These results highlight the importance in forming deeper connections between traditional methods and photonic approaches.}},
  author       = {{Eickmann, Jan-Lucas and Luo, Kai-Hong and Roiz, Mikhail and Lammers, Jonas and Atzeni, Simone and Pandey, Cheeranjiv and Lütkewitte, Florian and Shirazi, Reza G. and Schlue, Fabian and Brecht, Benjamin and Rybkin, Vladimir V. and Stefszky, Michael and Silberhorn, Christine}},
  issn         = {{2056-6387}},
  journal      = {{npj Quantum Information}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra}}},
  doi          = {{10.1038/s41534-026-01250-x}},
  volume       = {{12}},
  year         = {{2026}},
}

@article{65865,
  abstract     = {{Mathematical problem solving is a highly complex competence that needs
to be supported throughout the learning process. This study examines the role of
problem-solving heuristics among 73 sixth-grade students in a German secondary
school (Gesamtschule). Specifically, we focus on the empirical relationship between
the occurrence of heuristics, their suitability, and application, as well as their contribution
to problem-solving success. To this end, we developed a heuristic training that
introduced strategy keys (heuristic aid cards) accompanied by explanatory videos. By
leveraging variations in the successful application of the heuristics between students
and across multiple sessions (73 students in 4 training situations and 3 problems
in a final test), we discover from regression models with student and task-fixed effects
that a successful use of heuristics (i.e., an heuristic occurred, that heuristic had
a high suitability regarding the problem, and it was applied correctly) leads to more
successful mathematical problem solving. Regarding the underlying mechanism, we
find that all dimensions of heuristic use (occurrence, suitability, and application
of heuristics) are positively related to problem-solving success. When comparing
the predictive capacity of all three aspects, we identified the correct application of
heuristics as particularly conducive for better problem-solving success. In comparing
the group of students with high to those with low initial math competence, we find no significant differences in the relationship between heuristic use and problemsolving
success across achievement groups. Our results emphasize the crucial role
of heuristic application in mathematical problem solving, which generally benefits
students regardless of their overall math competence.}},
  author       = {{Herold-Blasius, Raja and Kleinschmidt, Hannah and Ziller, Conrad}},
  journal      = {{Journal für Mathematik-Didaktik}},
  number       = {{6}},
  title        = {{{Dimensions of Heuristic Use in Mathematical Problem Solving: Evidence from Early Secondary School Students}}},
  doi          = {{https://doi.org/10.1007/s13138-026-00270-6}},
  volume       = {{47}},
  year         = {{2026}},
}

@inbook{65915,
  author       = {{Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  booktitle    = {{Opus Fluidum Futurum—Rheology of Reactive, Multiscale, Multiphase Construction Materials}},
  title        = {{{Adaptive Coaxial Concrete Rheometer (ACCR): Honest Rheological Measurements and Corrections}}},
  doi          = {{10.1007/978-3-032-15391-3}},
  year         = {{2026}},
}

@article{65919,
  author       = {{Öhlschläger, Claudia}},
  journal      = {{Geschlecht und Macht (feministische studien)}},
  number       = {{1}},
  pages        = {{82--98}},
  publisher    = {{de Gruyter}},
  title        = {{{Metamorphosen als Akte weiblicher Handlungsmacht in Texten von Brigitte Kronauer, Han Kang und Camilla Grudova}}},
  doi          = {{https://doi.org/10.1515/fs-2026-0006}},
  volume       = {{44}},
  year         = {{2026}},
}

@article{65920,
  author       = {{Öhlschläger, Claudia}},
  journal      = {{Geschlecht und Macht (feministische studien)}},
  number       = {{1}},
  pages        = {{129--134}},
  publisher    = {{de Gruyter}},
  title        = {{{Zu Fotografien der Berliner Künstlerin Cihan Çakmak}}},
  doi          = {{https://doi.org/10.1515/fs-2026-0010}},
  volume       = {{44}},
  year         = {{2026}},
}

@article{65918,
  author       = {{Öhlschläger, Claudia and Riegraf, Birgitt}},
  journal      = {{Geschlecht und Macht (feministische studien)}},
  number       = {{1}},
  pages        = {{5--14}},
  publisher    = {{de Gruyter}},
  title        = {{{Geschlecht und Macht}}},
  doi          = {{https://doi.org/10.1515/fs-2026-0001}},
  volume       = {{44}},
  year         = {{2026}},
}

@misc{65917,
  booktitle    = {{feministische studien}},
  editor       = {{Öhlschläger, Claudia and Riegraf, Birgitt}},
  number       = {{1}},
  publisher    = {{de Gruyter}},
  title        = {{{Geschlecht und Macht}}},
  volume       = {{44}},
  year         = {{2026}},
}

@inbook{65930,
  author       = {{Peine, Sara}},
  booktitle    = {{Wasser Wesen Wandel. Fluidität in (mehr-als-)literarischen Medien}},
  editor       = {{Spener, Anna Maria}},
  location     = {{Paderborn}},
  pages        = {{254--277}},
  title        = {{{„When does a man become a monster?“ Odysseus’ fluide Identität in Jorge Rivera-Herrans’ EPIC – The Musical}}},
  doi          = {{10.17619/UNIPB/1-2560 }},
  year         = {{2026}},
}

@article{65922,
  abstract     = {{<jats:title>Abstract</jats:title>
                  <jats:p>A fundamental equation of state for tetramethoxysilane (TMOS) is developed based on the available experimental data. In addition, new density and speed of sound measurements were performed specifically for this work to improve the database. Owing to the limited overall data set, additional thermodynamic properties were analyzed to support the fitting procedure and ensure physically consistent behavior. Modified representations of thermodynamic properties that are typically employed in the fitting procedure were introduced to facilitate the application of constraints. The resulting model provides a consistent description of the thermodynamic properties of TMOS.</jats:p>}},
  author       = {{Fiedler, F. and Baumhögger, Elmar and Kruse, Simon and Lemmon, E. W. and Kasper, Tina and Thol, M.}},
  issn         = {{0195-928X}},
  journal      = {{International Journal of Thermophysics}},
  number       = {{7}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Thermodynamic Properties of Tetramethoxysilane}}},
  doi          = {{10.1007/s10765-026-03770-2}},
  volume       = {{47}},
  year         = {{2026}},
}

@article{65936,
  author       = {{Markewitz, Friedrich and Wilk, Nicole M.}},
  journal      = {{Zeitschrift für Literaturwissenschaft undLinguistik}},
  number       = {{1}},
  publisher    = {{Springer}},
  title        = {{{Vom Hühner-Holocaust über die Öko-Diktatur zum Kulturkampf um die Currywurst. Korpuslinguistische Perspektiven auf ernährungsbezogene Politisierungen}}},
  doi          = {{https://doi.org/10.1007/s41244-026-00427-3 }},
  volume       = {{56}},
  year         = {{2026}},
}

@misc{65939,
  author       = {{Markewitz, Friedrich}},
  booktitle    = {{Pop-Zeitschrift}},
  title        = {{{120 Tage im 'SS Experiment Love Camp'. Zu Genretropen und -kontroversen im Nazisploitationfilm}}},
  year         = {{2026}},
}

@misc{65940,
  author       = {{Markewitz, Friedrich}},
  booktitle    = {{Pop-Zeitschrift}},
  title        = {{{Art the Clown goes to Hollywood. Wenn transgressives Genrekino Mainstream wird}}},
  year         = {{2026}},
}

@techreport{65789,
  author       = {{Rohlfing, Katharina J. and Steinhardt, Isabel and Scharlau, Ingrid and Schaper, Niclas and Holtfreter, Susan and Biere, Lea and Grimminger, Angela and Schmidt, Rebecca and Festner, Dagmar Franziska and Schmidt, Rebekka and Buhl, Heike M. and Mindt, Ilka and Karsten, Andrea Ramona and Neiske, Iris and Luft, Sebastian}},
  title        = {{{(Nicht)Nutzung von KI-Werkzeugen in der Lehre: ein Reflexionspapier}}},
  doi          = {{10.17619/UNIPB/1-2576}},
  year         = {{2026}},
}

@inproceedings{65880,
  author       = {{Knaudt, Katharina and Herold-Blasius, Raja and Selter, Christoph}},
  booktitle    = {{Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14}},
  pages        = {{1–8}},
  title        = {{{Intertwining theory and practice: Design of planning phases in PD training to support effective teacher planning processes}}},
  doi          = {{https://hal.science/hal-05334687v1}},
  year         = {{2026}},
}

@article{65872,
  author       = {{Herold-Blasius, Raja and Gruhn, Katrin and Kleinschmidt, Vera and Thurm, Daniel and Tusche, Carina}},
  journal      = {{International Journal of Science and Mathematics Education}},
  number       = {{12}},
  pages        = {{1–27}},
  title        = {{{Fostering Knowledge Facets of the TPACK Framework Through Designing Digital Mathematical Escape Games – A Qualitative Content Analysis of Pre‑Service Teachers’ Self‑Reported Learnings and Challenges}}},
  doi          = {{10.1007/s10763-025-10625-z}},
  volume       = {{24}},
  year         = {{2026}},
}

@inproceedings{65870,
  author       = {{Herold-Blasius, Raja and Kleinschmidt, Vera}},
  booktitle    = {{Proceedings of the Nineteenth ERME Topic Conference: Connecting the Learning of Mathematics Teaching to Practice}},
  editor       = {{Mosvold, R. and Fauskanger, J. and Ferretti, F. and Vondrová, N.}},
  pages        = {{452–459}},
  title        = {{{TPACK learning paths of pre-service teachers when designing digital mathematical escape games}}},
  year         = {{2026}},
}

@book{65868,
  author       = {{Herold-Blasius, Raja and Kleinschmidt, Vera}},
  publisher    = {{TU Dortmund}},
  title        = {{{Digitale Escape Games in der Hochschullehre – Seminarkonzept}}},
  doi          = {{http://dx.doi.org/10.17877/DE290R-26557}},
  year         = {{2026}},
}

@book{66045,
  abstract     = {{ Over the last decades, Comparative Theology has established itself in varying methodological ways while considering the reality and plurality of religions. Although Comparative Theology can be a confessional or a non-confessional endeavor, most protagonists and theorists have been Western Christians. This could lead to the conclusion that Comparative Theology is in fact a Christian undertaking and implicitly or explicitly bound to conceptions like Christology. Furthermore, it could be argued that there is a certain asymmetry of power in the discourse between religions when the parameters of Comparative Theology are defined mainly by Christian theologians.

This volume aims to be the first step to programmatically and conceptionally explore the possibility of a genuinely Islamic Comparative Theology in a constructive endeavor. This endeavor should neither be misunderstood as an apologetic questioning of the status quo in Comparative Theology nor as a project that deconstructs Comparative Theology. Rather, by searching for new approaches from the Islamic traditions it opens up ways and forms of learning, hermeneutically complementary with prominent attitudes, methods in Comparative Theology. }},
  editor       = {{Nassery, Idris and Ghaffar, Zishan}},
  isbn         = {{978-3-11-143539-8}},
  issn         = {{2942-7975}},
  keywords     = {{Comparative Theology, Islamic Theology, Islamic Comparative Theology}},
  publisher    = {{De Gruyter}},
  title        = {{{Defining Islamic Comparative Theology}}},
  doi          = {{https://doi.org/10.1515/9783111435695}},
  volume       = {{Volume 1}},
  year         = {{2026}},
}

@inbook{66048,
  author       = {{Ghaffar, Zishan}},
  booktitle    = {{Defining Islamic Comparative Theology}},
  editor       = {{Nassery, Idris  and Ghaffar, Zishan}},
  keywords     = {{Covenant Theology, Qur'an, Comparative Theology, Islamic Comparative Theology}},
  publisher    = {{De Gruyter}},
  title        = {{{Chapter 5 Covenant Theology in the Qur’an—Challenges and Insights for Comparative Theology from a Muslim Perspective}}},
  doi          = {{https://doi.org/10.1515/9783111435695-006}},
  volume       = {{Volume 1}},
  year         = {{2026}},
}